Gas-tight joint for boiler casings removably mounted upon firepots



May 22, 1923. 1,456,254

J. PIERCE, JR

GAS TIGHT JOINT FOR BOILER CASINGS HEMOVABLY MOUNTED UPON FIREPOTS FiledMarch 16. 1925 Patented May 22, I923.

UNIE ST TES JOHN PIERCE, JR., OF NORWALK, CONNECTICUT, ASSIGNOR O1?ONE-HALF TO DICKINSON S. CUMMINGS, OF STAMFORD, CONNECTICUT.

GAS-TIGHT JOINT FOR BOILER CASINGS REMOVABLY MOUNTED UPON FIREPOTS.

Application filed March 16, 1923. Serial No. 625,497.

To all whom it may concern:

Be it known that I, JOHN Pmnon, Jr., a citizen of the United States,residing at Norwalk, in the county of Fairfield and State ofConnecticut, have invented a new and useful Improvement in Gas-TightJoints for Boiler Casings Removably Mounted upon Firepots; and I dohereby declare the following, when taken in connectiori with theaccompanying drawings and the characters of reference marked thereon, tobe a full, clear, and exact description of the same, and which saiddrawings constitute part of this application, and

Y represent, in-

Fig. 1 a view in side elevation of a firepot having a removableboilercasing mounted upon it. the joint between the two parts beingconstructed in accordance with my invention.

Fig. 2 an enlarged broken sectional view on the line 22 of Fig. 1.

Fig. 3 a broken plain view, on the scale of Fig. 2, of one corner of thefirepot.

My invention relates to an improved gas tight joint for that class ofboiler-casings which are removably mounted upon the firepots of thesteam-generating units of steam automobiles, tractors. airplanes,road-rollers. etc, the object being to insure a gastight joint betweenthe removable boilercasing and the firepot, no matter how frequent theoccasion to remove the casing.

lVith these ends in 'view, my invention consists in certain. details ofconstruction as will be hereinafter described andparticularly pointedout in the claims.

In carrying out my invention, as herein shown. I emplov a boiler-casingconsisting ,2 of a sheet-metal shell 5 having a lining 6 of insulatingand refractory material. the lower end of which is beveled, as at 7, tocomplement the bevel 8 formed at the upper end of the insulating and,refractory lining 9 of the firepot. which has a sheet-metal shell 10.The lower edge of the shell 5 isv carried below the lower point of thebevel 7 to form aflexible sealing-flange 11, which is intended to sleeveover, with a relatively snug fit, the bent upper edge 12 of the firepotshell 10. When the boiler-casing is in place, the flange 11 of its shell5 fits over the bent upper edge 12 of the casing 11 of the firepot 9, asshown in Fig. 2. Now to insure the maintenance of contact and a closefit between the flange 11 and edge 12,

I employ a yielding seal consisting of a continuous inwardly anddownwardly projecting pressure-flange 13, turned inwardly from the upperedge of a sheet-metal band 14: attached by rivets 15 to thefirepot-casing 10 and spaced therefrom by a reinforcing strap 16.

It will be readily understood that the pressure-flange 13 exerts aconstant effort to crowd the flexible sealing-flange 11 against theouter face of the upper edge 12 of the firepot-casing 10, and thusmaintain a gas-tight joint between them. Furthermore. any gas which mayescapev between these two surfaces is prevented from further escaping bythe contact of the edge 13 with the exterior surface of the flange 11.

I claim:

1. The combination with a firepot having a sheet-metal shell and alining, of a removable boiler-casing comprising a sheetmetal shell, anda lining below the lower edge of which the shell extends to form asealing-flange adapted 'to make close contact with the exterior surfaceof the upper edge of the firepot-shell. and an inwardly and downwardlyprojecting pressure-flange carried by the firepot and adapted 'to exerta constant inward pressure upon the said flange when the boiler-casingis applied to i the firepot.

2. The combination with a firepot, having a sheet-metal shell and alining, of a removableboiler-casing comprising a sheetmetal shell and alining below the lower edge of which the said shell extends to form asealing-flange adapted to make close contact with the exterior surfaceof theupper edge of the shell of the firepot, a spacing strap applied tothe shell oft-he firepot, ad jacent to the upper edge thereof. andaninwardly and-downwardly projecting pressure-flange secured to the saidstrap, in position to exert a constantinward pressure upon the saidsealing-flange when the boiler casing is applied to the firepot.

In testimony whereof. I have signed this specification in the presenceof two subscribing witnesses.

JOHN PIERCE, JR. Witnesses GEORGE DUDLEY SEYMOUR, MALCOLM P. NIcHoLs.

